Sound Producing Devices TRIZ Cases

A silicone casing and sound-attenuating mat cut dishware clatter above 80 dB while protecting users with hearing aids or noise sensitivity.

Pre-generated inverse audio tracks cancel unwanted voices or commentary while keeping other sound audible through precise playback synchronization.

Tapered seafloor-coupled resonators with gas-filled cavities dissipate pile-driving noise to meet marine noise limits and protect wildlife.

Embedded actuators in an aircraft seat or bed headrest create a local quiet zone, cutting noise while avoiding heavier cabin-wide systems.

Precomputed mirror-room mapping determines virtual audio source positions for accurate early reflections with lower runtime computation.

Pre-stored maritime sound sequences and battery power replace manual air horns, avoiding depressurization and crew distraction in low visibility.

Detects EOC instability from frequency-response changes, then limits signal energy and retunes adaptation to prevent cabin noise.

Shifting and downsampling a stored impulse response lets active noise reduction track seat position changes and keep cancellation effective.

Adjusts notch frequency and level by sound source height to preserve accurate out-of-head localization as direction changes.

Selectable resonator portions and adjustable neck or cavity settings let one acoustic module target different noise frequencies and reduce sound diffusion.

Selective closure of Helmholtz resonator openings tunes absorption to target frequencies, reducing sound diffusion in changing noise environments.

A chained feedforward-feedback ANC architecture uses residual-noise feedback to widen attenuation bandwidth while protecting playback quality.

A stability judgment mechanism monitors filter behavior and adapts to secondary path changes to prevent noise amplification and abnormal sounds.

Precomputed filter sets matched to environmental spectrum features improve directional noise cancellation without heavy real-time processing.

Dynamic gain adjustment and signal mixing help vehicle ANC handle transient noise sources while avoiding noise boosting artifacts.

Mirror-room mapping calculates virtual audio source positions for room reflections with lower computation and responsive source movement updates.

Dynamic gain lookup and reference mixing help vehicle ANC cancel transient noise sources while avoiding noise-boosting artifacts.

Using epichlorohydrin polymer with foaming and crosslinking agents, this case improves sound absorption above 2000 Hz for EV motor noise.

Separate fan enclosures, outlet channels, and acoustic barriers cut cabinet noise while sustaining over 20 kW heat dissipation.

Real-time microphones and underbody speakers cancel vehicle exterior noise along targeted paths without complex predictive models.

Sensor input identifies nearby or whitelisted sound sources, reducing cancellation amplitude so users can hear important ambient speech and alerts.

A two-stage DSP filter creates an anti-phase correction signal that suppresses long-lasting room modes while keeping the original sound intact.

Measured exterior tire and underbody noise is cancelled with real-time anti-phase sound, avoiding complex road and tire prediction models.

A unified VSPL reference sets distance-based attenuation across multiple virtual sound sources, preserving natural loudness differences with less setup effort.

An electromagnetic clutch and motor automate bowl striking while adjusting knocking frequency and volume for flexible sound output.

Pre-seeded adaptive filter coefficients let vehicle ANC respond faster to gear-shift RPM changes and restore engine order cancellation quickly.

Small transducers paired with shaped acoustic reflectors maintain beam width, cut cost, and reduce damage and water-ingress risk.

Adhesive stiffness and strength are tuned with scatterer resonance to reduce flexural-wave reflection and improve peak-frequency absorption.

Sensor-driven spatial audio recreates customizable engine soundscapes in the cabin with real-time pitch, volume, and location changes.

Thin 3D-printed Helmholtz metasurfaces absorb multiband server fan noise while preserving heat dissipation and system performance.

A replaceable acoustically transparent front cover cuts panel waste and cost while preserving sound absorption and user-safe fiberglass isolation.

Pre-evaluating cabin audio lets engine noise compensation target drive-motor sound only, improving EOC stability and preserving other audio.

Subband virtual microphone filtering cuts vehicle ANC compute load while improving broadband and high-frequency noise reduction near occupants.

Coherence-based shaping filters let vehicle RNC tune frequency response while preserving LMS adaptation for broader cabin road-noise reduction.

Frequency-segmented echo processing within each rotation angle suppresses target position errors during fast underwater scanning.

A vibrating internal plate creates two resonance spaces to widen sound absorption and reduce dips between absorption peaks without added damping.

Using test sounds and a head-and-torso simulator, each headphone is calibrated to correct leakage, microphone variation, and ANC defects.

Injection-molded acoustic cells with tapered elements widen low-frequency attenuation while reducing panel size and sealing errors.